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https://issues.apache.org/jira/browse/LUCENE-4751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-4751.
-------------------------------------
Resolution: Won't Fix
The problem here is that you are getting this critical
TooManyOpenFilesException which already brings down your site. You should raise
the open files limit and I recommend you to upgrade to a newer lucene version.
2.9.2 is pretty old.
> IndexReader close throwing NullPointerException
> -----------------------------------------------
>
> Key: LUCENE-4751
> URL: https://issues.apache.org/jira/browse/LUCENE-4751
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 2.9.2
> Environment: RedHat
> Reporter: Anusha Rao
>
> Hi,
> Has anyone seen the NullPointerException as shown below
> before? We have used Lucene to build a public site search functionality.
> All the IndexReader objects in there are closed appropriately except one that
> throws the following error and results in (too many files open) exception.
> This brings the entire site down.
> The lucene version we are using is lucene-core-2.9.2.jar
>
> Any idea what could cause this exception?
>
>
> java.lang.NullPointerException
> at
> org.apache.lucene.index.SegmentReader$Norm.decRef(SegmentReader.java:393)
> at
> org.apache.lucene.index.SegmentReader.doClose(SegmentReader.java:868)
> at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:170)
> at
> org.apache.lucene.index.DirectoryReader.doClose(DirectoryReader.java:803)
> at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:170)
> at org.apache.lucene.index.IndexReader.close(IndexReader.java:1302)
> at search.Searcher.search(Searcher.java:387) // the close in this
> class does not execute
>
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